Only fax the IRS when your notice, letter, or form instructions give you a fax number, and use that exact number. Put the notice or form on top, scan everything into one clear PDF, and send it with an online fax service. Save a copy and your receipt. For many notice replies, the IRS Document Upload Tool is an alternative.
The IRS still uses fax for many tasks, from EIN applications to replies to notices. But there's no single "IRS fax number." The right number depends on what you're sending and where you live. This guide shows you how to get it right the first time.
Can you fax documents to the IRS?
Yes, in many cases. A few official examples:
- Replying to a CP2000 notice: The IRS lists fax numbers for each processing location and tells you to use the one shown on the top left of your notice (IRS: Understanding your CP2000 series notice).
- Applying for an EIN with Form SS-4: You can mail or fax Form SS-4. If your business or residence is in one of the 50 states or D.C., the IRS lists fax number 855-641-6935 (IRS: Where to file Form SS-4).
- Power of attorney (Form 2848) or tax information authorization (Form 8821): If you can't use an online option, you can fax or mail these forms (IRS). The fax numbers depend on your state and are listed in the Form 2848 instructions. Paper forms sent by fax or mail need a handwritten signature; the IRS doesn't accept digital or typed signatures on them.
The IRS notes in the Form 2848 instructions that its fax numbers "may change without notice." Always check the current notice, form, or IRS.gov page before you send.
Where do I find the right IRS fax number?
| What you're sending | Where to find the fax number |
|---|---|
| Reply to an IRS notice or letter | On the notice itself (often top left or in the "How to reply" section) |
| Form SS-4 (EIN application) | Where to file Form SS-4 |
| Form 2848 or 8821 | Form 2848 instructions, "Where To File Chart" |
| Documents for an IRS employee you're working with | Ask that employee for their fax number |
Avoid "IRS fax number" lists on random websites. Numbers can change, and a wrong number can delay your case. If your notice doesn't show a fax number, use the reply method it does list.
How do I fax the IRS step by step?
- Read your notice or form instructions. Confirm that fax is an accepted method and note the deadline.
- Put the right page on top. For a notice reply, include a copy of the notice or the response page it asks for. For a form, the completed form is the first page.
- Add your supporting documents in a logical order.
- Scan everything into one PDF. Your phone works fine. See How to fax from your iPhone for scanning tips.
- Check the PDF. Every page should be straight, complete, and readable. Make sure signatures are visible where required.
- Send the fax. With sendfaxfast.com, enter the IRS fax number with +1, upload the PDF, and pay for that one fax. You don't need an account or a subscription.
- Keep your records. Save the PDF you sent, your payment receipt, and any status information. Write down the date and time.
What does it cost?
| Fax type | Pages | Price (USD) |
|---|---|---|
| Short fax | 1–5 | $2.49 |
| Long fax | 6–20 | $3.49 |
| XL fax | 21–40 | $4.99 |
| XL Fax Plus | 41–100 | from $6.24 |
Prices per fax as of October 2026, the same for the US & Canada (+1), Australia (+61), New Zealand (+64), and 39 more supported countries. XL Fax Plus costs $4.99 plus $1.25 for each started 10 pages beyond 40. Maximum 100 pages per fax. Single faxes need no account and no subscription.
Is it safe to fax tax documents online?
Tax documents include very personal data, so it's worth a moment of thought. The IRS's own advice on its CP2000 page is direct: "If you use an online fax service, understand its privacy and security policies" (IRS.gov). A few habits help:
- Send only the pages the IRS asked for.
- Double-check the number before you hit send.
- Be wary of "free" services that make money in unclear ways. Read their policies.
Should I use the IRS Document Upload Tool instead?
If your notice mentions it, the upload tool is a good option. The IRS describes the Document Upload Tool as "a secure, easy and fast way to send information to the IRS." It lets you upload JPG, PNG, or PDF files and get confirmation that the IRS received your documents. You'll need the access code or notice number, the name on the notice, and your SSN, ITIN, or EIN.
Two limits to know: The IRS says not to submit tax returns through the tool. It's for responding to notices and letters, so it doesn't replace every fax workflow, such as some form submissions.
How do I know the IRS received my fax?
A successful fax means the IRS fax system accepted the pages. It doesn't mean someone has reviewed them yet. Keep your records and allow time for processing. For a deeper explanation of confirmations, read How do I know my fax went through?
Also, pick one delivery method. Sending the same reply by fax, mail, and upload can create duplicate paperwork. Only resend if the IRS asks you to.
Frequently asked questions
Is there one general IRS fax number?
No. The correct number depends on the form or notice and often on your location. Use the number on your notice or in the official form instructions.
Can I fax my tax return to the IRS?
Generally, tax returns are filed electronically or by mail. Only fax a return if the IRS specifically tells you to, for example in a notice or by an IRS employee handling your case.
Do I need a cover sheet when faxing the IRS?
Follow your notice's instructions. Many people put a copy of the notice or the IRS response form on top, which helps the IRS match your fax to your case.
Can I fax the IRS from my phone?
Yes. Scan your pages to a PDF with your phone, then send the PDF through an online fax service like sendfaxfast.com.
How long does the IRS take to process a fax?
It varies by department and workload, so we can't give a reliable number. Check your notice or IRS.gov for current processing information.
This article is general information, not tax advice. Always follow the instructions on your IRS notice or form.